How to test vm.variable - function(){..} unit testing with jasmine? - angularjs

Question

I am using karma- jasmine framework to test my angular application. I'm facing a problem in calling the functions of the controller or service form my test-spec. I tried using controller. as well as scope. but both of them didn't work for me.
The controller code is
(function () {'use strict';
angular.module('selfUi').controller('AttendeesController', AttendeesController);
AttendeesController.$inject = ['$state', '$stateParams', 'AttendeeService', 'settings', '$log'];
function AttendeesController($state, $stateParams, AttendeeService, settings, $log) {
var vm = this;
if ($stateParams.attendeeData === null) {
vm.pageType = "Add Attendee";
vm.isEdit = false;
} else {
var tempAttendee = $stateParams.attendeeData;
vm.pageType = "Edit Attendee";
vm.isEdit = true;
vm._id = tempAttendee._id;
vm.firstName = tempAttendee.firstName;
vm.lastName = tempAttendee.lastName;
}
vm.checkAvailable = function(email){
//Check email
if(email === null || angular.isUndefined(email) || email.trim().length === 0){
vm.invalidEmail = true;
}else{
// Check if email is already present or not
success = function(data, status, headers, config) {
if(data[0].success){
vm.validEmail = true;
}else{
if(data[0].message){
modalData = {
success : false,
};
}else{
vm.validEmail = false;
}
}
};
failure = function(data, status, headers, config) {
vm.invalidEmail = false;
};
AttendeeService.checkEmail(email, success, failure);
}
};
} })();
My test spec is:
describe('AttendeesController', function(){
beforeEach(module('SS'));
var state, $stateParams, stateParams, settings, AttendeeService, log;
var email= "temp#email.com";
var controller, $scope;
var vm;
$stateParams= {_id : "1",
attendeeType : "attendee",
firstName : "Pen",
lastName : "Red",
email : "temp#email.com",
company : "SWG",
jobTitle : "Speaker",
biography : "bio",
tagsInterest : "interests"}
beforeEach(inject(function($rootScope, _AddAttendeeService_, $controller, $state, $stateParams,settings, $log) {
AttendeeService= _AttendeeService_;
state= $state;
$scope = $rootScope.$new();
controller = function() {
return $controller('AttendeesController', {
$scope : scope,
$stateParams : $stateParams
});
};
}));
it('should be instantiated', function() {
expect(AttendeeService).toBeDefined();
});
it('should have controller.methods defined', function(){
expect(controller).toBeDefined();
expect(controller.checkAvailable).toBeUndefined();
controller.checkAvailable(email);
});
});
My service code looks like this:
(function() {
'use strict';
angular.module('SS').service('AttendeeService', AttendeeService);
AttendeeService.$inject = ['SSFactory', 'settings', '$rootScope'];
function AttendeeService(SelfSFactory, settings, $rootScope){
this.addAttendee = function(data, success, failure){
var responsePromise = SelfServiceFactory.httpPostRequest(settings.createAttendeeURL, data, config);
responsePromise.success(success);
responsePromise.error(failure);
return responsePromise;
};
}});
When I run my test spec, it gives me a error
TypeError: 'undefined' is not a function (evaluating 'controller.checkAvailable(email)')
at C:/Users/IBM_ADMIN/WebstormProjects/Self/self-service-ui.git/src/tests/addAttendees.controller.spec.js:53
I tried calling the checkAvailable function with the scope variable too, but it didn't work. I need to know how to call such methods in the controller from my test spec.